1. A094_e
Inductive-potentiometric displacement sensors
vipSENSOR
Engagement length control in high performance screwdrivers
Industrial screwing in automated production This means that it is now possible to realize different
systems is carried out by automatic screwdrivers. engagement lengths automatically at the station by
Apart from the torque, the engagement length is the appropriate program selection. The flexibility of the
most important criterion for the quality of the production line is therefore increased. In addition, the
screwing operation. Generally, the engagement setting up times for adjusting the limit switches are no
length, i.e. the screw-in depth, is determined with the longer needed.
aid of a mechanical end-stop or by using a limit
switch. Consequently, once set, the engagement Measurement system requirements
length cannot be changed during the production - Measurement range: 0 to 70 mm (0 to 2.76 in)
process. - Repeatability: <0.05 % FSO (0.04 mm)
- Analog output: 0 - 10 V
The inductive potentiometric displacement sensors - Supply: 24 VDC
in the VIP Series provide decisive advantages in this
application. The continuous measurement of the
engagement length from 0 to 70 mm enables
screwing operations with various depths to be
carried out at the same station.
vipSENSOR
for top limit
position
pneumatic
cylinder
piston
vipSENSOR for
engagement
length
engagement
length

2. Application
Measurement principle
The acquisition of the engagement length occurs
using a sensor which is mounted concentrically on
the outside of the pneumatic piston. It measures the
piston position without contacting it through the
cylinder wall. Wear on the sensor is therefore
eliminated. Furthermore, no access into the
pneumatic cylinder is needed. Another sensor
operating on the same measurement principle
measures the top limit position of the piston. This is
brought out separately to facilitate simple adaptation
to cylinders with different strokes. Both sensors are Displacement sensors for engagement length and top limit
controlled from a compact electronic evaluation unit position with electronic evaluation unit.
which supplies an analog displacement signal or
switching signal.
Reasons for selecting the system
- Continuous, wear-free m e a s u r e m e n t o f t h e
engagement length.
- No adjustment of limit switches or mechanical
end-stops.
- Compact size
- Customer-specific OEM versions
Other application examples for OEM customers
- Dosage cylinder in glass
- Shock absorbers
- Synchronized cylinders
- Pneumatic pumps
MICRO-EPSILON A member of micro-epsilon group.
Koenigbacher Str. 15 Tel.: 0 85 42/1 68-0 info@micro-epsilon.com Certified DIN EN ISO 9001 : 2000
94496 Ortenburg / Germany Fax: 0 85 42/1 68 90 www.micro-epsilon.com Modifications reserved Y9781094